/**
 * 
 */
package cn.agiledata.bank.common.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.sql.Blob;
import java.sql.SQLException;
import java.util.Random;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
 * @author 马贤波
 * 
 * Apr 4, 2006
 */
public class ImageUtil {

    private static Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    public static String getRandomNumber(int digit) {

        // 生成随机类
        Random random = new Random();

        String result = "";
        for (int i = 0; i < digit; i++) {
            String rand = String.valueOf(random.nextInt(10));
            result += rand;
        }

        return result;
    }

    public static RenderedImage getVerifyImage(int verifyNumber) {
        return getVerifyImage(String.valueOf(verifyNumber));
    }

    public static RenderedImage getVerifyImage(String verifyNumber) {
        Random random = new Random();

        // 在内存中创建图象
        int width = 60, height = 20;
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);

        // 获取图形上下文
        Graphics g = image.getGraphics();

        // 设定背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);

        // 设定字体
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));

        // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }

        // 将认证码逐个以不同颜色写入
        String code = verifyNumber;

        for (int i = 0; i < code.length(); i++) {
            char sing = code.charAt(i);
            // 将认证码显示到图象中
            g.setColor(new Color(20 + random.nextInt(110), 20 + random
                    .nextInt(110), 20 + random.nextInt(110)));// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
            g.drawString(String.valueOf(sing), 13 * i + 6, 16);
        }

        g.dispose();

        return image;
    }

    public static void blobImageToOutputStream(Blob blob, OutputStream out,
            double compressSize, String defaultImageUri) throws SQLException,
            IOException {
        if (blob == null && defaultImageUri == null)
            return;
        InputStream in = blob == null ? new URL(defaultImageUri).openStream()
                : blob.getBinaryStream();
        if (compressSize <= 0) { // 不压缩
            byte buf[] = new byte[4096];
            int len;
            while ((len = in.read(buf, 0, buf.length)) != -1) {
                out.write(buf, 0, len);
            }
            in.close();
            out.close();
        } else { // 压缩
            Image src = ImageIO.read(in);
            in.close();
            int oldWidth = src.getWidth(null);
            int oldHeight = src.getHeight(null);
            double tempdouble;
            if (oldWidth > oldHeight) {
                tempdouble = oldWidth / compressSize;
            } else {
                tempdouble = oldHeight / compressSize;
            }
            int newWidth = (int) Math.round(oldWidth / tempdouble);
            int newHeight = (int) Math.round(oldHeight / tempdouble);
            BufferedImage tag = new BufferedImage(newWidth, newHeight,
                    BufferedImage.TYPE_INT_RGB);
            tag.getGraphics().drawImage(src, 0, 0, newWidth, newHeight, null);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(tag);
            out.close();
        }
    }

}
